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   Instructions on how to install modern Gentoo Linux on ancient 486-based
   PCs.
   [42]yeokhengmeng.com/2018/01/make-the-486-great-again/

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   [77]gentoo-on-486 [78]The Hardware [79]Deployment machine : IBM PS/1
   Consultant 2133 19C (released in 1993) [80]Compilation machine:
   Thinkpad T430 (released in 2012) [81](Optional) Machine to issue SSH
   commands to compilation machine [82]Instructions [83]1. Preparing the
   install media/disks [84]2. Networking and SSH [85]3. Preparing the
   disks [86]4. Installing stage3 [87]5. Installing base system [88]Read
   the news [89]Set system profile [90]Configure timezone [91]Configure
   locale [92]6. Configuring the kernel [93]Find out system specs [94]Just
   take the latest stable kernel [95]Download a particular kernel version
   [96]Kernel options [97]64-bit Kernel [98]Processor type and features:
   [99]Bus Options [100]Device Drivers [101]File Systems [102]Backup
   kernel configuration [103]Compiling the kernel [104]7. Configuring the
   system [105]Configuring /etc/fstab [106]Set hostname [107]Network info
   [108]System config [109]8. Installing tools [110]Required installs
   [111]Correct syslog issues [112]Optional installs [113]9. Configuring
   the bootloader [114]Install Bootloader [115]Configure LILO [116]10.
   Finalising install [117]Create non-root user [118]Unmount and
   reboot/poweroff system [119]11. Boot on i486 [120]Change preferred
   Python version [121]Update time [122]Sound test [123]Configure Web
   Server [124]Bonus step:

[125]README.md

gentoo-on-486

   Instructions on how to install modern Gentoo Linux on ancient 486-based
   PCs. This is for a command-line install only.

   As Gentoo is a source-based distribution, we have to compile every
   package we install from scratch including the kernel and bootloader.

   This is too time-consuming to do on the 486 PC so I use a modern
   machine to do the compilation then move the disk over to the ancient
   PC.

   I have written a [126]companion blog post that explains the motivations
   and less-technical details.

The Hardware

Deployment machine : [127]IBM PS/1 Consultant 2133 19C (released in 1993)

   [128]Screen
     * AMD 5X86 486-clone running at 133mhz (similar performance to
       Pentium 75Mhz)
     * Cirrus Logic VLB CL-GD5424 Graphics 512KiB VRAM
     * 64MB SDRAM
     * 48x IDE CD ROM Drive
     * [129]Gotek 1.44MB floppy emulator
     * CompactFlash-IDE adapter + 32GB Sandisk Extreme CF card
     * 10Mbps 3Com Etherlink III [130]3c509B (ISA)
     * [131]Sound Blaster 16 CT2950 PnP (ISA) Unfortunately, this card
       uses [132]CQM.
     * 1x Parallel Port
     * 2x Serial Port
     * 1x VGA port

Compilation machine: [133]Thinkpad T430 (released in 2012)

   [134]Screen
     * Intel Core i7-3520M (3.50 GHz, 4MB L3, 1333MHz FSB)
     * Intel HD Graphics 4000
     * 16GB DDR3 - 1600MHz
     * Gigabit Ethernet
     * Ultrabay DVD-RW
     * 2x USB 3.0, 2x USB 2.0
     * USB-CF adapter to compile on CF card
     * SSD removed to avoid corrupting it by accident during install

(Optional) Machine to issue SSH commands to compilation machine

   This can be any machine capable of SSH. This will be explained later.

Instructions

   I heavily reference official [135]Gentoo Wiki x86 handbook with some
   tweaks to suit the 486 as well as ease of repeated builds. Please note
   that my instructions are a compliment and are not a replacement to the
   official guide.

1. Preparing the install media/disks

   [136]Gentoo Wiki: Choosing the media

   I use a CompactFlash card as my hard disk for my 486 PC to make it easy
   to transfer the image back and forth between it and the compilation PC.

   Download the x86 Minimal Installation CD ISO image from [137]official
   download page. You can burn the ISO image to CD or to a USB flash drive
   but I opt for the former for simplicity.

   Once you are done, boot from the install media using your modern
   compilation machine. You might have to adjust your BIOS settings to do
   so.

2. Networking and SSH

   [138]Gentoo Wiki: Configuring the network

   The official guide included quite a bit of information on setting
   things up.

   For my case, I used a wired LAN with DHCP and everything just worked on
   boot. If you need a special configuration, consult that guide.

   I highly recommend that you turn on SSH at this point so you can
   copy-paste the commands to run instead of manually typing in the
   commands. You can even do additional configuration while the packages
   are compiling.
passwd root
New Password: blahblah
Again: blahblah

/etc/init.d/sshd start
ifconfig

   Use the third machine and ssh root@X.X.X.X

3. Preparing the disks

   [139]Gentoo Wiki: Preparing the disks

   The guide suggests 4 partitions with the first one being for the BIOS
   boot partition for EFI systems. Since our 486 obviously predates EFI, I
   opt to ignore that and use the following layout instead.
   Partition Filesystem     Size     Description
   /dev/sda1 ext2       128M         Boot
   /dev/sda2 (swap)     2048M        Swap
   /dev/sda3 ext4       Rest of disk Root

   Just a note, ancient PCs have a [140]504MiB barrier. This means that
   the boot partition should reside entirely within this limit to be
   bootable. Once Linux is started, it can recognise the entire disk.

   I created my partitions using the fdisk tool. Note for the swap
   partition, you have to set the partition type. Type t to set the
   partition type, 2 to select the partition just created and then type in
   82 to set the partition type to "Linux Swap".

   Once done, format the partitions:
mkfs.ext2 /dev/sda1
mkswap /dev/sda2
swapon /dev/sda2
mkfs.ext4 /dev/sda3

mount /dev/sda3 /mnt/gentoo

4. Installing stage3

   [141]Gentoo Wiki: Installing Stage 3

   stage3 contains almost all the files to create a bare minimum system.
date
# If date is wrong, use ntpd to update your PC's clock.
ntpd -q -g

   Download the latest i486 stage3 tarball which at the time of writing is
   named stage3-i486-20180117T214502Z.tar.xz. I highly recommend
   downloading from a mirror close to you instead of using the official
   one.
cd /mnt/gentoo
wget http://gentoo.aditsu.net:8000/releases/x86/autobuilds/current-stage3-i486/s
tage3-i486-20180117T214502Z.tar.xz

# Untar the tarball. If you wish, you can add the `v` verbose option.
tar xpf stage3-i486-20180117T214502Z.tar.xz --xattrs-include='*.*' --numeric-own
er

   The guide says you should edit the /mnt/gentoo/etc/portage/make.conf
   and adjust the CFLAGS and CXXFLAGS to suit your system. However for
   this case, we can skip this as the default is already the 486. But do
   verify just in case.
CFLAGS="-O2 -march=i486 -pipe"
CHOST="i486-pc-linux-gnu"

MAKEOPTS="-j5" # A good choice is the number of CPU cores in the system plus 1
USE="-kde -qt4 -qt5 ffmpeg mp3 alsa"

   If you want to, you can add the MAKEOPTS setting to benefit the
   compilation machine. The optional USE flags is to remove unwanted GUI
   support as well as add some audio support when compiling. MP3 support
   is extremely poor due to the slow processor speed, but you can give it
   a shot.

5. Installing base system

   [142]Gentoo Wiki: Installing base system

   Just run the following commands I lifted from the guide.
mirrorselect -i -o >> /mnt/gentoo/etc/portage/make.conf
# To avoid having to run mirrorselect manually in your next build, you can save
your list and add it next time.
# GENTOO_MIRRORS="http://gentoo.aditsu.net:8000/ http://ftp.iij.ad.jp/pub/linux/
gentoo/ http://ftp.jaist.ac.jp/pub/Linux/Gentoo/ http://ftp.daum.net/gentoo/ htt
p://ftp.kaist.ac.kr/pub/gentoo/ http://ftp.lanet.kr/pub/gentoo/ http://ftp.tware
n.net/Linux/Gentoo/"

mkdir --parents /mnt/gentoo/etc/portage/repos.conf
cp /mnt/gentoo/usr/share/portage/config/repos.conf /mnt/gentoo/etc/portage/repos
.conf/gentoo.conf
cp --dereference /etc/resolv.conf /mnt/gentoo/etc/

mount --types proc /proc /mnt/gentoo/proc
mount --rbind /sys /mnt/gentoo/sys
mount --make-rslave /mnt/gentoo/sys
mount --rbind /dev /mnt/gentoo/dev
mount --make-rslave /mnt/gentoo/dev

chroot /mnt/gentoo /bin/bash
source /etc/profile
export PS1="(chroot) ${PS1}"

mkdir /boot # This can be ignored as it seems to exist already
mount /dev/sda1 /boot
emerge-webrsync

Read the news

eselect news list
eselect news read

Set system profile

   The default system profile is [10] default/linux/x86/17.0 (stable)
   which I use.

   Changing system profiles will invoke a long compilation process
   especially for GCC, to save time, you can skip this step for your
   initial test builds.
eselect profile list

# Example changing to profile "default/linux/x86/17.0" which is the 10th profile
 at time of writing
eselect profile set 10
# If profile change is required, run the following:
emerge --ask --update --deep --newuse @world

Configure timezone

ls /usr/share/zoneinfo # To see available locales
echo "Asia/Singapore" > /etc/timezone
emerge --config sys-libs/timezone-data

Configure locale

nano -w /etc/locale.gen
#Adjust your locale settings

locale-gen

eselect locale list
eselect locale set 4 # Change 4 to the one you prefer. Use the one with UTF
env-update && source /etc/profile && export PS1="(chroot) $PS1"

6. Configuring the kernel

   [143]Gentoo Wiki: Configuring the kernel

   The wiki suggest using genkernel tool. It does not seem to work for the
   486 setting so we must use the manual configuration method.

Find out system specs

   pciutils entirely optional especially since my system does not have PCI
   bus.
emerge sys-apps/pciutils sys-apps/lshw

Just take the latest stable kernel

emerge sys-kernel/gentoo-sources

Download a particular kernel version

   I decided to use the 4.14.x kernel release as the previous stable
   4.12.x is rather old by now. However 4.14 is not marked stable, see
   this [144]issue.
emerge --ask =sys-kernel/gentoo-sources-4.14.8-r1 # Then make the config file ch
anges
dispatch-conf # Press 'u' to accept
emerge --ask =sys-kernel/gentoo-sources-4.14.8-r1

Kernel options

cd /usr/src/linux
make menuconfig

   Kernel options I used on top of the default. It might differ for your
   setup. I chose to compile everything into the kernel instead of using
   modules.

   I enable traditional options as well as some modern ones as so the
   kernel can still work with my modern machine if I need to compile new
   packages in future.

64-bit Kernel

     * Uncheck this!!!

Processor type and features:

     * Uncheck "Symmetric multi-processing support"
     * Processor Family - Check 486
     * Check Generic x86 support

Bus Options

     * Check ISA support

Device Drivers

     * Plug and Play support
     *
          + ISA Plug and Play support
     *
          + Plug and Play BIOS support
     * SCSI device support
     *
          + SCSI disk support
     * SATA and PATA drivers
     *
          + Generic ATA support
     *
          + Legacy ISA PATA support (Experimental)
     * Network device support
     *
          + Ethernet driver support
     *
          +
               o 3Com devices
     *
          +
               o
                    # 3c509/3c579 "Etherlink III" support
     * Sound card support
     *
          + ALSA
     *
          +
               o ISA sound devices
     *
          +
               o
                    # Check SB16 (PnP)
     * USB Support
     *
          + xHCI HCD (USB 3.0) Support
     *
          +
               o Generic xHCI driver for a platform device
     *
          + USB Mass Storage support
     *
          +
               o Tick everything related to cards and bridges
     * MMC/SD/SDIO card support

File Systems

     * Enable all Ext2 and Ext4 relevant options
     * CD-ROM/DVD Filesystems
     *
          + Tick all
     * DOS/FAT/NT Filesystems
     *
          + Tick the NTFS options
     * Network File Systems
     *
          + SMB3 and CIFS support
     *
          +
               o Tick relevant sub options

Backup kernel configuration

   To make it easier to do subsequent rebuilds, you might want to backup
   the current configuration. Once you do so, you just have to upload
   .config and don't have to run make menuconfig.
# Backup
scp root@X.X.X.X:/mnt/gentoo/usr/src/linux/.config .

# Put back
scp .config root@X.X.X.X:/mnt/gentoo/usr/src/linux/

Compiling the kernel

make -j5 #Replace 5 with num CPU cores + 1
make modules_install
make install

# This is entirely optional for such an old system but might be useful for your
compilation machine
emerge sys-kernel/linux-firmware

7. Configuring the system

   [145]Gentoo Wiki: Configuring the system

   I only adjust a subset of the settings in the guide that are relevant
   to me.

Configuring /etc/fstab

nano -w /etc/fstab

# Those are my settings based on my partition layout above
/dev/sda1   /boot        ext2    defaults,noatime     0 2
/dev/sda2   none         swap    sw                   0 0
/dev/sda3   /            ext4    noatime              0 1
/dev/cdrom  /mnt/cdrom   auto    noauto,user          0 0

Set hostname

nano -w /etc/conf.d/hostname
hostname="tux"

Network info

emerge --noreplace net-misc/netifrc

nano -w /etc/conf.d/net

# Replace eth0 with the actual network interface name. Use `ifconfig` to check.
# You can put multiple as well to easily transit between the compilation and 486
 PC.
# eth0 is used by my 3Com NIC in the 486 PC
# enxxxx is used by my compilation machine

config_eth0="dhcp"
config_enxxxx="dhcp"
## End

cd /etc/init.d

ln -s net.lo net.eth0
rc-update add net.eth0 default

ln -s net.lo net.enxxxx
rc-update add net.enxxxx default

System config

# Set root password
passwd

nano -w /etc/conf.d/hwclock
# Set local clock instead of UTC if you wish
clock="local"

8. Installing tools

   [146]Gentoo Wiki: Installing tools

Required installs

# Install system logger
emerge app-admin/sysklogd
rc-update add sysklogd default

# Install cron daemon
emerge sys-process/cronie
rc-update add cronie default

# Install file indexing tools
emerge sys-apps/mlocate

# Start SSH on boot
rc-update add sshd default

# Install file systems tools
emerge sys-fs/e2fsprogs sys-fs/dosfstools

# Install DHCP
emerge net-misc/dhcpcd

# NTP
emerge net-misc/ntp

# If ALSA is enabled in the USE flags
emerge media-libs/alsa-lib
emerge media-sound/alsa-utils
rc-update add alsasound boot

# If FFmpeg is enabled in the USE flags
emerge media-video/ffmpeg

Correct syslog issues

   I tested after reboot, I got No such file or directory errors on some
   files. Since I do not need them, I just made the following changes.
nano /etc/syslog.conf

# Comment out the following lines
#news.crit                       /var/log/news/news.crit
#news.err                        /var/log/news/news.err
#news.notice                     -/var/log/news/news.notice

# Change
*.=notice;*.=warn       |/dev/xconsole
# to
*.=notice;*.=warn       |/dev/tty6 # Or any other tty since I don't use xconsole
 on my system.

Optional installs

   Note that the following may take a significant amount time to compile.
emerge sys-apps/hwinfo
emerge www-servers/nginx
emerge dev-vcs/git
emerge media-sound/moc

# Golang only works for Pentium MMX CPUs and up. But you can install this to see
 the failure message for fun.
emerge dev-lang/go

# Gentoo's default Python version is only 3.5 at time of writing. You can instal
l Python 3.6 but Portage and others will still remain on Python 3.5.
emerge dev-lang/python:3.6

# Command line web browsers
emerge www-client/elinks
emerge www-client/w3m
emerge www-client/lynx

9. Configuring the bootloader

   [147]Gentoo Wiki: Configuring the bootloader

Install Bootloader

   In theory, one should use the modern Grub2 bootloader. Grub2 loads ok
   but the system reboots the moment I select a boot option. This seems
   like a known issue given the age of the system. So I use the older LILO
   instead.
emerge sys-boot/lilo

Configure LILO

   Adjust the kernel version to suit yours
nano -w /etc/lilo.conf
### Add the following
boot=/dev/sda             # Install LILO in the MBR
prompt                    # Give the user the chance to select another section
timeout=50                # Wait 5 (five) seconds before booting the default sec
tion
default=gentoo            # When the timeout has passed, boot the "gentoo" secti
on

image=/boot/vmlinuz-4.14.8-gentoo-r1
  label=gentoo
  read-only
  root=/dev/sda3
  vga=4                   # This will set the VGA mode to 80x30

image=/boot/vmlinuz-4.14.8-gentoo-r1
  label=gentoo-ask-vga
  read-only
  root=/dev/sda3
  vga=ask                 # Linux will ask you to pick the VGA mode on startup

image=/boot/vmlinuz-4.14.8-gentoo-r1
  label=gentoo-rescue
  read-only
  root=/dev/sda3
  append="init=/bin/bb"
### End

/sbin/lilo

10. Finalising install

   [148]Gentoo Wiki: Finalizing

Create non-root user

#Add non-root user. By default, you cannot SSH in as root user.
useradd -m -G users,wheel,audio -s /bin/bash john
passwd john

Unmount and reboot/poweroff system

exit
cd
umount -l /mnt/gentoo/dev{/shm,/pts,}
umount -R /mnt/gentoo

reboot # This is preferred so the SSH keys can be generated for the first time o
n your compilation machine instead of taking like ages on the 486 PC.
poweroff

   For some strange reason, I cannot reliably boot with a USB-CF card
   adapter. Subsequent powerups on my Thinkpad sometimes fail. Booting up
   with a native SATA-CF adapter works fine. See the bonus step.

11. Boot on i486

   Transfer the disk to the 486 PC and hope it boots! Very slowly.... but
   it'll work. Good luck!

   All commands below except ALSA stuff are only usable if you are the
   root user but I'm sure you can find a way to solve that. You also
   cannot SSH in via the root user by default.

Change preferred Python version

   If you installed another Python version earlier.
eselect python list
# Select your preferred Python version
eselect python set 2

Update time

   Just in case...
ntpd -q -g

Sound test

   If you want to test the sound, you can run the following commands:
alsamixer # Remember to increase PCM volume
speaker-test -t wav -c 2

Configure Web Server

   If you installed nginx earlier, you can try your hand at hosting
   something. [149]Reference
mkdir /var/www/localhost/htdocs
# Create a dummy page
echo 'Hello, world!' > /var/www/localhost/htdocs/index.html
nano /etc/nginx/nginx.conf
# Change `listen 127.0.0.1;` -> `listen 0.0.0.0;`

/etc/init.d/nginx start

# Start on boot
rc-update add nginx default

Bonus step:

   If for some reason you need to rescue the Gentoo installation (say if
   kernel fails), you can try booting up from the install CD and mount the
   disk instead of installing from scratch. These are the instructions you
   can use based on above:
# These are if you want to SSH into the system
passwd root
New Password: blahblah
Again: blahblah

/etc/init.d/sshd start
ifconfig
#

mount /dev/sda3 /mnt/gentoo

mount --types proc /proc /mnt/gentoo/proc
mount --rbind /sys /mnt/gentoo/sys
mount --make-rslave /mnt/gentoo/sys
mount --rbind /dev /mnt/gentoo/dev
mount --make-rslave /mnt/gentoo/dev

chroot /mnt/gentoo /bin/bash
source /etc/profile
export PS1="(chroot) ${PS1}"

mkdir /boot # This can be ignored as it seems to exist already
mount /dev/sda1 /boot

About

   Instructions on how to install modern Gentoo Linux on ancient 486-based
   PCs.
   [150]yeokhengmeng.com/2018/01/make-the-486-great-again/

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